Discussion
State whether the following is true or false.
Water quality affects the reproducibility of a shade from batch to batch.
Answer: A
Correct answer: True
Hardness, iron, alkalinity and dissolved solids all affect how a dye behaves - the exhaustion, the shade and the fastness - so the same recipe in different water gives a different result. That is why a mill measures its water and treats it to a specification rather than accepting whatever the supply delivers, and why a change of borehole or season can shift shades unaccountably.
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